I have a 400GB hard drive on my Win 2008 virtual machine. Disk Management reports that it has 30.25GB (8%) free space. When I right click on the one and only top most folder, it reports a size on disk of 177GB. I can't figure out where the other 220GB went!
I have show hidden files turned on, shadow copies are disabled on the drive, recycle bin is empty and WinDirStat does not reveal anything.